Interviewed with recruiter who was 10 minutes late before contacting me, then took another 10 mins to call the correct number. Interview was very short, asked my expected salary amongst a few other questions. Ended the salary with "How's the market right now, not great is it?" Then snarkily hung up on me. Awful experience, could not believe how unprofessional he was.

For a senior developer interview focusing on Java and AWS, these five key concepts are essential: 1. **Design Patterns** (in Java) 2. **Microservices Architecture** 3. **AWS EC2** (Elastic Compute Cloud) 4. **Docker & Kubernetes** 5. **CI/CD Pipelines** (Continuous Integration/Continuous Deployment)